:root {
  --bg: #0b0b0b;
  --text: #e8e8e8;
  --muted: #a0a0a0;
  --panel: #151515;
  --panelHover: #1d1d1d;
  --border: #2a2a2a;
  --accent: #ff3b3b;
}

* {
  box-sizing: border-box;
}
html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial,
    "Apple Color Emoji", "Segoe UI Emoji";
}
img {
  max-width: 100%;
  height: auto;
}
a {
  color: inherit;
}

.site-header {
  padding: 16px 16px 8px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 5;
}
.site-header h1 {
  margin: 0;
  font-size: 1.5rem;
}
.tagline {
  margin: 4px 0 0;
  color: var(--muted);
}
.back-link {
  text-decoration: none;
  color: var(--muted);
  display: inline-block;
  margin-bottom: 4px;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px;
}

.volume-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
}
.volume-card {
  display: block;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  text-decoration: none;
}
.volume-card img {
  display: block;
  width: 100%;
  height: 260px;
  object-fit: cover;
  background: #111;
}
.volume-caption {
  padding: 8px 10px;
  color: var(--muted);
  font-size: 0.95rem;
}
.volume-card:hover {
  background: var(--panelHover);
}

.chapter-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 12px;
}
.chapter-item {
  display: block;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px;
  text-decoration: none;
  overflow: hidden;
}
.chapter-item:hover {
  background: var(--panelHover);
}

.chapter-item img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  display: block;
  background: #111;
  border-radius: 6px;
}

.chapter-label {
  text-align: center;
  color: var(--muted);
  padding: 8px 4px 4px;
}

.site-footer {
  padding: 16px;
  color: var(--muted);
  border-top: 1px solid var(--border);
  text-align: center;
}

/* Utility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}